Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a8df6f1c42d8295bfcfa52cab87342e5bae30e6a9e8db83b359250d1eb553c' 
  AND token = 'sS/Zlk1mlFfxEeX+5DI3dEs/2an+0Fe7AgS9hYLuIfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}